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When running Cisco-MDS diagnostics which perform driver-level frame loop back, the switch is reporting errors. Diagnostic has a limit on latency that is not being met by the driver. The requirement of Latency frames is that they should be responded back by the host with a maximum delay of few hundreds of microseconds. If the switch doesn't get response frames within this time frame, it fails the test. Test is failing as the lpfc-wq workqueue was overwhelmed by the packet rate and in some cases, the work element yielded to other kernel elements. To resolve, reduce the outstanding load allowed by the adapter. This ensures the driver spends a reasonable amount of time doing loopback and can do so such that latency values can be met. Load is managed by reducing the number of receive buffers posted such that the link can be backpressured to reduce load. Link: https://lore.kernel.org/r/20191218235808.31922-9-jsmart2021@gmail.com Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.